Answer:
a. Chart (attached)
b. and c. graph attached
Step-by-step explanation:
a. We use the equation given to us and plug in the values of "x" that have been shown to find the corresponding values of y.
So, when x=0, 
when x=20, 
when x=40, 
b. The graph has been shown in a similar manner. All the three points of part a are connected to form the straight line y=6.75x+25. So, we have (0,25), (20,160) and (40, 295)
c. The y axis is the earnings in dollars and the x axis is the number of hours worked.
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<h3>
<u>Cookies</u></h3>
Rob: 3
Barry: 8
Kevin: 9
Let's add all of that up.
3 + 8 + 9
11 + 9
= 20 cookies total
<h3><u>
Milk</u></h3>
Rob: 2
Barry: 1
Kevin: 4
Let's add this up.
2 + 1 + 4
3 + 4
= 7 cups of milk
They had 20 cookies and 7 cups of milk before they ate.